Panic: invalid taxonomy state [0.55]

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I have the same Issue. My GitLab pipeline stopped working after I made some changes in forestry. I downgraded to 0.54.0 and everything was working again as expected.

On a blog I created, I implemented the authors as taxonomies as it’s done in this tutorial: https://www.netlify.com/blog/2018/07/24/hugo-tips-how-to-create-author-pages/

In summary:

  • Authors are declared as taxonomy in config.toml
  • Author’s ‘data’ resides inside 'content/authors//_index.md
  • List of authors is layouted by ‘layouts/authors/terms.html’
  • Author’s page is layouted by 'layouts/authors/list.html"

This worked fine in Hugo 0.54.0, but fails with the following error in Hugo 0.55.0:

Building sites … panic: invalid taxonomy state for 
"D:\\...\\content\\authors\\test-author\\_index.md" with sections [authors test-author]

goroutine 76 [running]:
github.com/gohugoio/hugo/hugolib. 
(*pageState).getTaxonomyNodeInfo(0xc00082e150, 0x1011e7a)
    /root/project/hugo/hugolib/page.go:744 +0x1ee
github.com/gohugoio/hugo/hugolib. 
(*HugoSites).createMissingPages(0xc000388000, 0x0, 0x0)
    /root/project/hugo/hugolib/hugo_sites.go:653 +0x340
github.com/gohugoio/hugo/hugolib. 
(*HugoSites).assemble(0xc000388000, 0xc00046b480, 0xc0007b9c70, 0x20)
    /root/project/hugo/hugolib/hugo_sites_build.go:245 +0x141
github.com/gohugoio/hugo/hugolib.(*HugoSites).Build.func2.2()
    /root/project/hugo/hugolib/hugo_sites_build.go:98 +0x43
runtime/trace.WithRegion(0x124a340, 0xc00074cf90, 0xff51a6, 0x8, 0xc0007b9d20)
    /usr/local/go/src/runtime/trace/annotation.go:137 +0xf0
github.com/gohugoio/hugo/hugolib. (*HugoSites).Build.func2(0xc000579dc0, 0x20)
    /root/project/hugo/hugolib/hugo_sites_build.go:100 +0x244
github.com/gohugoio/hugo/hugolib.(*HugoSites).Build.func3()
    /root/project/hugo/hugolib/hugo_sites_build.go:109 +0x36
runtime/trace.WithRegion(0x124a340, 0xc00074cf90, 0xff223b, 0x7, 0xc000579ec8)
    /usr/local/go/src/runtime/trace/annotation.go:137 +0xf0
github.com/gohugoio/hugo/hugolib.(*HugoSites).Build(0xc000388000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
    /root/project/hugo/hugolib/hugo_sites_build.go:111 +0x7c4
github.com/gohugoio/hugo/commands.(*commandeer).buildSites(...)
    /root/project/hugo/commands/hugo.go:763
github.com/gohugoio/hugo/commands.(*commandeer).fullBuild.func3(0x8, 0x10a34b0)
    /root/project/hugo/commands/hugo.go:313 +0x80
golang.org/x/sync/errgroup.(*Group).Go.func1(0xc00074cf60, 0xc000531dd0)
    /go/pkg/mod/golang.org/x/sync@v0.0.0-20180314180146-1d60e4601c6f/errgroup/errgroup.go:58 +0x5e
created by golang.org/x/sync/errgroup.(*Group).Go
    /go/pkg/mod/golang.org/x/sync@v0.0.0-20180314180146-1d60e4601c6f/errgroup/errgroup.go:55 +0x6d

Scanning over the changes in 0.55.0 I id not find any major change that would account for this.

I created a basic git example to test this behaviour: https://gitlab.com/Ukmasmu/hugo-0.55.0-taxonomy-change

It should work fine with Hugo 0.54.0, but the build error should appear in Hugo 0.55.0.

Thank you in advance.